"AI will kill us all! The machines will rise up!" - what is being done to dispel such myths?
Nothing.  

Its in almost everyone's favor for it to stay that way financially. Having non-technical individuals associate AI with terminators makes a perception that the field has greater capabilities than it does $\rightarrow$ this leads to grants, funding, etc...  

Is there any negative? Yes. Misconceptions always have drawbacks. We see the creation of dumb ethics boards and such cough cough Elon Musk.

But if history has anything to say about this, as the field gains popularity (which it is dnagerously quick), information will spread by definition, and eventually misconceptions will be laid to rest.

Note that this answer is biased and based upon my own opinions